On the theory of operators of the form $\frac{d^m}{dt^m}-A$
Differencialʹnye uravneniâ, Tome 3 (1967) no. 11, pp. 1957-1970.

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     author = {V. K. Romanko},
     title = {On the theory of operators of the form $\frac{d^m}{dt^m}-A$},
     journal = {Differencialʹnye uravneni\^a},
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     publisher = {mathdoc},
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     year = {1967},
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     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_11_a10/}
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V. K. Romanko. On the theory of operators of the form $\frac{d^m}{dt^m}-A$. Differencialʹnye uravneniâ, Tome 3 (1967) no. 11, pp. 1957-1970. http://geodesic.mathdoc.fr/item/DE_1967_3_11_a10/